linux-kernel - Re: [PATCH RFC] reduce runqueue lock contention

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Date:	Mon, 21 Jun 2010 15:04:39 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Chris Mason <chris.mason@...cle.com>
Cc:	Ingo Molnar <mingo@...e.hu>, axboe@...nel.dk,
	linux-kernel@...r.kernel.org, Mike Galbraith <efault@....de>,
	Oleg Nesterov <oleg@...hat.com>, tglx <tglx@...utronix.de>
Subject: Re: [PATCH RFC] reduce runqueue lock contention

On Mon, 2010-06-21 at 12:54 +0200, Peter Zijlstra wrote:
> > It looses the ttwu task_running() check, as I must admit I'm not quite
> > sure what it does.. Ingo?

I think I figured out what its for, its for when p is prev in schedule()
after deactivate_task(), we have to call activate_task() it again, but
we cannot migrate the task because the CPU its on is still referencing
it.

I added it back, but still fireworks :-)
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